# Chrono vs Nidoria

The clearest difference is ads: Chrono at none against Nidoria's shown. Chrono also leads on update cadence (every 3 days vs every 2 months). Nidoria's advantage is iOS requirement (15.0 vs 18.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Chrono sells 6 in-app purchases, starting at $4.99 per month and Nidoria sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Chrono ships an update every 3 days, Nidoria every 2 months. Both last shipped on October 31, 2026.

## The numbers

| Metric | Chrono | Nidoria |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/nidoria-sleep-tracker/id6762128229/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 582 MB | 159 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Leonardo Barros Bilhalva](https://appshunter.io/developer/1868122530) | [AppAspect Technologies Pvt. Ltd.](https://appshunter.io/developer/962656494) |

## What reviewers say

### Chrono

[App page](https://appshunter.io/ios/app/chrono-sleep-tracker/id6757658348)

**Features:** Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chrono Premium - Monthly | $4.99 | per month |
| Chrono Premium - Monthly | $4.99 | per month |
| Chrono Premium - Annual 60% Off | $11.99 | per year |
| Chrono Premium - Annual | $20.99 | per year |
| Chrono Premium - Annual | $20.99 | per year |
| Chrono Premium - Annual | $29.99 | per year |


### Nidoria

[App page](https://appshunter.io/ios/app/nidoria-sleep-tracker/id6762128229)

This app tracks sleep quality using phone sensors, providing detailed sleep stage analysis and a daily sleep score. It offers soothing sounds, smart alarms, and motivational tools to help users improve their sleep habits and wake up refreshed.

**Highlights:** Automatic sleep tracking without wearables, Sleep stage classification (Awake, Light, Deep, REM), Daily Sleep Score (0-100), Soothing sleep sounds library, Smart alarm for gentle wake-ups, Sleep reports and history, Bedtime reminders and streaks

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Subscription | $4.99 | per month |
| Yearly Premium Subscription | $14.99 | per year |


## Frequently asked questions

### Is Chrono free?

Chrono is free to download, with in-app purchases available.

### Is Nidoria free?

Nidoria is free to download, with in-app purchases available.

### Do Chrono or Nidoria have ads?

Nidoria shows ads; Chrono does not.

### Which is updated more often, Chrono or Nidoria?

Chrono ships an update every 3 days, and Nidoria every 2 months. Most recently, Chrono was updated on October 31, 2026 and Nidoria on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*